Free-chain planetary hoist



Jam 13, 1942- F. w. coFFlNG FREE-CHAIN PLANETARY HOIST F11-ed oct. 8, 19:57

4 sheets-shea 1 nu wm H Elll,

Jan. 13, 1942. F. w. coFFlNG FREE-CHAIN PLANETARY HOIST Filed OG't. 8, 1957 4 Sheets-Sheet 2 "0 INVENTOR. F/ffx/cw nf. ofF//va ATTORNEY5.

Jan.' 13, 1942. F. w. cor-FING FREE-CHAIN PLANETARY HOIST 4 Sheets-Sheet 3 Filed Oct.

INVENTOR. amm n( (kfw/v6.

ATTORNEYS.

l l I -1- E Jan- 13, 1942- F. w. col-FING FREE-CHAIN PLANETARY HoIsT Filed Oct. 8, 1957 4 Sheets-Sheet 4 lNvENToR.

Rian/m' PM (oFF/N6. M 2ML ATroRNEY.

Patented Jan. 13, 1942 anstatt' Application October 8, 1937, Serial No. 167,959 In Great Britain September 8, 1937 10 Claims. {(GL 254-171) This'invention relates toa chain or like hoist ycapable of free-chain action, embodying a planetary type mechanism, a brake mechanism, a speed .control or governor mechanism and which is hand operable for local elevating and lowering 'and hand controlled.

This invention is a radical improvement upon certain'prior -patented structures such as illusr'trated in the prior Patents No. 1,862,331 dated June 7, 1932;A No. 1,937,331 dated November 2, 193.3'; No. 1,973,844 dated September 18, 1934;-N0. 1,999,036 dated April 23, 1935; and No. 2,044,565 4dated June 16, 1936, and the pending application Serial No. 755,259f11ed November 30, 1934, entitled Free-chain hoist, yallowed February 25,

'1937, new Patent No. 2,099,676 dated November This invention also is an improvement upon Y that disclosedin the pending application Serial No. 49,919,1iled November 15, 1935, entitled Free-chain planetary hoist, now Patent No.

22,159,419, dated Merch 14, 1939.

This invention includes the basic features of a brake mechanism, a speed control or governor mechanism, and a planetary mechanism.

The chief object of the invention is to produce a hoist which will have a highly desirable safety factor arrangement andwhich is capable of freechain action, when desired, in either direction.

` Another object of the invention is to produce 'I' a load hoisting structure aving parts capable of selective association to vary the speed and capacity thereof as hereinafter set forth.

The chief feature of the invention is the hoist which is capable of Iaccomplishing the chief object.

The full nature of the invention will be understood from the accompanying drawings 'and the `following description and claims:

Infthe drawings ,'Fig. 1 is a centralvsectional View through a hoist embodying vthe `present invention, the load chain being omitted and extreme ends of the supporting hook and operating handle being'/ omitted for clearness, a member of the latter being shown in position to actuate the brake mechanism. I,

Fig. 2 is aside elevational View looking at Vthe handle end of the hoist, parts of the supporting hook and the handle being omitted and other parts of the vhandle mechanism being broken away to show the same in section and to illustrate other parts more fully, dotted lines indieating the chain passage, sprockets and chain portions.

Fig. 3 is an elevational view of the immediate brake voperating and control mechanism, parts being broken away'to show the same in section and to illustrate other portions of the same and other partsmorefully.

Fig. 4 is a similar'viewlof the selective manual control for rthe planetary clutch arrangement, whereby vfree-'chain lowering without the load is possible'. Fig. 5 is a transverse sectional view of the extendedp'ortion'of the housing associated with the parts illustrated in Figs. 3 and 4.

Fig. 6 lis an elevational view of the governor orspeed control mechanism. Fig. 'Z is a side elevational view of a portion of the'hoist, aportion of the handle being broken away and sectioned to show other portions thereof Vin greater detail, lthe brake actuating handle member being shown in non-actuating position.

Fig. 8 isa central sectional view of another form of the present invention.

Fig. 9,is a side elevation thereof. Fig.l 10 isa sectional view taken on line I3-I3 of Fig. 8 andin the'` direction of the arrows and v'of the one-way clutch shown therein. y

` Fig. 11 is a central'sectional view of another form of the invention land similar to that shown in Figs. 8 to 10, inclusive. Fig. 12 is a side elevation thereof.

iIn Figs. 1 to 7 of the drawings I0 indicates one portion` of a'housing and Ily a complementary vcover forming portionfthereof. The two are suitably-secured togetheras at I3. The two form a .chamber Mfor receiving the head l5 of a supp ortinghook` I6 vhaving the cylindrical portion I1 swiveled in the bearingV |8a and I8b.

Y The twogportions land II of the housing and covermalso provide a chamber I9 in which is mounteda load chain engaging sprocket carried by the shaft 2l and herein the two are shown integral. The cover portion Il has an outwardly f ,directed hub portion 22 which rotatably supports the portion 23 o f the shaft 2|.

f l The shaft is further extended 4at 24 andr rotatably supports the hub portion-25 of the body portion 26 of the handle structure having the extended portion 21. The body portion 26 of the handle is extended toward the cover as at 28 and telescopes, as it were the adjacent portion 22a of the cover, as shown clearly in the upper right hand portion of Fig. 1,. f

l The shaft portion 2I-see Fig. l-as well as portions 23 and 24 are provided with aligned and communicating lubricant receiving passages 29, 30 and 3|, respectively, the latter being threaded to receive a closure in the form of a cap screw 32 bearing on a washer 33 that engages the outer end 34 of the hub portion 25 of the handle. By this means the handle is not only detachably associated with the hoist structure but lubricant may also be supplied to the interior mechanism, to which reference will be had hereinafter, which mechanism includes a planetary system.

The lower part of chamber |9 is open as at 35. In aligned bearings 36a and 36h formed in housing I0, and cover and housing respectively, is mounted a shaft 31 which rotatably supports an intermediate sprocket or gear 38, there being interposed therebetween an anti-friction construction in the form of rollers and the like 3 9. The purpose of this intermediate sprocket or gear will be hereinafter set forth.

The housing includes a depending well portion 40 while the cover includes a depending portion 4|. The aligned apertures 42a and 42b in the well portion and 43 inthe depending portion 4|, rotatably support a shaft 44. The cover plate 45 is suitably secured as at 46 to the well portion 40 and closesthe same.

The housing I0 includes a chamber l1v which is closed by a cover plate 48 suitably secured to the housing as at 49 and said cover plate 48 is recessed as at 5|) to provide a closed bearing which receives an anti-friction structure 5| in the form of a ball race, or the like, for rotatably supporting the shaft portion 52. As previously set forth, shaft portion 23 is rotatably supported in the hub portion 22 of the cover and housing member The shaft portion 2| which projects through the partition portion 53 of the housing |0 is enlarged as at 54 and is rotatably supported by the inwardly directed hub portion 55 on partition 53. This hub portion 55 constitutes the rotatable support for the primary shaft 2| with which is associated the handle structure, previously briefly mentioned.

The extended end 54 of this primary shaft., see Fig. 1, is recessed at 59 and receives the end 58 of the shaft 59, the two shafts being rotatably associated together by the anti-friction structure, such as therollers 51. This shaft 52, 58, 59 is the supplementary shaft and with it is associated the planetary transmission, brake mechanism and the speed control or governor mechanism hereinafter described.

A plate 59, see Fig. 1, has a hub portion 6| keyed as at 62 or otherwise suitably secured to the supplementary or secondary shaft 59. Concentric therewith and integral with plate 60, is a brake drum structure 63. Opera-tively associated therewith is a brake band 54 provided with brake lining 65, or the equivalent. Reference will be had hereinafter to the brake loperating structure per se, although it is to be understood, the brake band substantially encircles the brake drumsee Fig. 3.

At the extreme left hand portion of Fig. l is illustrated the speed control and the same is more fully illustrated in Fig. 6. In said figure 68 indicates a suitable friction lining, or the "like, carried by the shoe portions 61, each of which has one end connected at 68 to a link 59 pivotally connected at 10 to the plate 60. An arm 1| also is pivotally connected as at 10 `-to the plate 60.

The arm 1|, see Fig. '6,'inc1udes an enlarged or weighted portion 12 that mounts a bumper 13 adapted to engage the collar portion 14 of an aligning device having the rod portion 15 slidably associated with the lug portion 1E on the weight 12. The opposite end of each shoe portion 61 is pivotally connected as at 11 to the free end of the other lever arm 1| and counterweight 12. If desired, one or more springs 18 may be associated with the weighted arms as at 19 and anchored to the plate portion 50 as at 80. Substantially the same form of centrifugal operable speed control is illustrated in Fig. 5 of application, Serial No. 49,919. For a more complete description of the operation of the same per se, reference is made thereto.

Rotatably supported on the hub portion 55 of the partition portion 53 of the housing |0--see Fig. l-is the external planetary gear housing 8| having external ratchet teeth 82 offset toward the left relative to the central support. This offset arrangement forms a chamber 83 closed by a press-fitted or otherwise suitably secured plate '84, the shaft 59 extending therethrough. Thus, lubricant supplied to the chamber 83 through the other and primary shaft 2|-23-24 does not enter the chamber 41 except chamber portion 83 thereof enclosed within and formed by the cover 84 and the planetarymember 8|.

The extreme left hand and exposed end of shaft 2| (portion 54)-see Fig. 1- is provided with a plurality of keyways, four in number, of which two are shown, receiving keys 85 that key 4the pinion support plate 85 to the handle operable shaft 2|. Plate 86 supports the pinion shafts 81, each of which rotatably supports a pinion gear 88. Press fitted or otherwise secured Ito the interior of portion |89 of the exterior or ratchet portion planetary member 8|, is the internal ring gear structure 90 having the teeth 9| which mesh with the pinion gears 88. If desired, the teeth 9| may be formed directly upon the interior of portion |89. In (the rotation of shaft 2| (handle operable) for load elevating the pinions revolve about the shaft 59 having sun gear teeth 89 thereon. In such revolution of the pinion gears l88, the vshaft 59, the speed control device and the brake structure do not rotate with the handle operable shaft 2|, for the ratchet teeth 82 on housing 8| is arranged to always permit housing 8| to rotate with the shaft 2 |2324 in the load elevating direction.

The foregoing also `is suilicient for an 'understanding of free-chain movement in the load elevating direction when such movement is desired when there is no load on load chain |12.

The means for holding planetary member 8|-99 against rotation in one direction and permitting normal rotation in the opposite direction is shown clearly in Fig. 4. The lockingv dog or pawl 92 is supported on the shaft 93 carried at opposite ends by the well portion 40 of housing I0. The dog is apertured as at 94 and a cotter key or like connection 95 is mounted therein and anchors one end of spring 96 anchored by a cotter key 91 or an equivalent device, as at 98 to the housing Il) or the Well portion 40 thereof. This spring structure normally retains the dog 92 in Contact with the ratchet teeth 82` and permits the ratchet to rotate counterclockwise, as shown in Fig. 4, but constrains dog 92 to prevent reverse rotation of the ratchet, as shown in the same ligure, unless the dog is withdrawn from ratchet engagement which is accomplished as follows:

The dog 92 includes a spring support 99 with which isl associated a spring |00. 'I'he other end thereof is carried by a pull rod |0| that extends through' aperture |92 in cover plate 45 of the well portion 40. Said rod terminates in a finger piece |03.

'\ It'will benoted-the draft, as indicated at- |04,

lsee Fig. 4,' onthe dog issuchth-at the greater the tendency to? rotate clockwise, the greaterfwill be .the locking' effort exerted bythe dog. The dog .is prevented from dropping out-of tooth en- 'gagement byspring 96.- -When finger piecev |03 'ment, rod |0|, see Fig.4, carries pin |03a having ends normally slidable inslots |02a in .tube 45a carried by cover 45. .The Aend of this tube 45a also is notched transversely as at ||a. When pin |03@ is Aseated therein, pawl or dog 92 is held out of ratchet engagement, When released, th'e pin nests in slots |02a and spring |00 ltends to hold same nested and spring 9S functions-to restore the locking dog 92 to loperative engagement with the ratchet. f

If inthe load elevating movement, there should occur a slight reverse movement',` of ratchet .teeth 82,7portion 93a of pawl immediately engages the adjacent surface of well 40,' and prevents pawl tilting in a counterclockwise direction-see Fig. 4.

The combined planetary ratchet wheel when free from the dog, may rotate in either direction, whereas previously it was free lto rotate only in a counterclockwise direction. i

Reference will now behad toFigs. 3 and 5, wherein the operatingrzand supporting mechanisms of the brake structure are more specifically illustrated. l The'brake band 64, `carrying the lining 65 if desired, has one end |05 encircling shaft 93 supported by the well 40 and by the intermediate ear` |01 rigid therewith, see'Fig, 5. Any other desired form of brake band anchorage may be employed. f g i The other end of thebrake `band .includes an elongated aperture |08. `O ne curled end of the spring ||0 is associated with the aperture. The opposite curled end'of springvl I0 is secured to the apertured endof a threadedtmember having the externally exposed tool engageable portionA |09 and having threaded engagement with-the f threaded aperture ||2 in the well yportion 40.

The tension exerted by the brake band in normal operation is adjusted by member||| and such adjustment is retained vby the nu't 3 ythreaded on member I Il and bearing upon the well surface.

An arm ||4, see Fig. 3,'projects into the aperture |08 and is notched as at ||5 and is carried by shaft ||6 supported by opposite sidesA of the well structure 40, as showninv Fig. 5. `Brake arm ||4 is one arm of. a bell crank pinned as at ||1 t0 the shaft H6, the other arm 8 thereof being pivotally associated with a pair of links ||9 at |20. The opposite endsof said` links are pivotally associated at |2| with arm or lever member |22 pinned or otherwise secured as vat |23-see Fig. -to the shaft 44 which, asbefore stated, is supported by the two depending walls of the Well portion 40 and by the depending portion 4| of the cover and housing member 'I'hisshaft 44 projectsthrough theportion 4| and on its prooffset recessed .portion |26 which slidably supports a laterally' projecting bolt |21 normally projected toward the hoist body by spring |28, as hereinafter set forth. The handle supports "a cover portion |29 apertured at |30 for. the manual control rod 3| which is reciprocated longitudinally of the handle.. Rod |3| has the offset portion |32 and the end |33.

An angular and `stiff springv member' a |34 iis carriedgby a power pawl, hereinafterfto bede.- scribed, Vand the spring has its free'end. apertured as at |35y to receive the end |33, the angular portion of the latter andthe offset portion permitting relative movement ofr thepower pawl without interference from the rod |3| When, however, the rod 3| is actuated lsoas to cause they same Vto move upwardly, having -reference to Fig.

7, the offset portion |32 engages the angular member |34 and thewire member`|36 slifdably associated therewith and. which is lp'ivotally'asusociated as at |36a with the'bolt |21, causesther y bolty |21 to be retracted so thatit' moves toward the right in Fig. 7. 'Ihismovement retraets the bolt |21 so that theY exposed v.end lof the bolt no longer .extends `outwardly a sufficient distancelto engage astop surface |31, see Fig. 2, on the cover portion of the hoist.

The Vat spring |38+see Fig. 1-carried by the i handlebearszonlthe shouldered portionv |21a of the bolt. |21 and further'retracts the bolt sothat it clears the ledge and'stop portion |31r and is in7 position to engage the inclined portion- 238;see

' Fig.'2-kofthe member |39 pivoted on an extena similar function in thatit constrains the powerv jecting or extended endhas secured to it, as by sion` |40` of rthe"'sl1aftf31f thatrnount's'the idler sprocketl S23-see Fig.' 1. 'I'he opposite end ofthe member |39 is recessed as at |4| fand straddles,

as it were, the lever `arm |25 which isthe brake actuating arm. Thus,=in thenorrnal operation of the handlegwhichcan move froml the'position shown in Fig. y2 counterclo'ckwise until the A handle engages the stopA |06 onxthe cover portion', the bolt member |21-see Fig. l-is ineffective for actuation. However, after the bolt member |21eng`ages .the stop |31on the cover ,.portion, further movement in the load elevating direction is impossible, The brake mechanism'is arranged i so that it will lonly function for load `lowering when it isactuated by meansv of ythe bolt v|2`| clearing Vthe stop` |31 and tilting the lever 39 for tilting Vthe shaft 44 through vportion |25, which 'releases the brake mechanism through lever 4-| |8- see Fig. 3. l

.The handle structureherein disclosed is similar to the handle structure shown in Patent No. y

1,937,33l-- 's,ee Figs. y4 to' 6 thereof, Rodj|3|f see Fig. l-herein is similar -to rod v35|35` shown in'said patent, except `in this instance, the

end of rod4 |3| is offset. Member |36 hereinis similar to member 9| of the patent. Plate `34 of said patient disclosure is similar to plate |34 shown hereinsee Fig. 7. Spring |28 is the equivalent of spring 32 of said 'patent and has pawl |43, pivotally supported by the h,andle't0` ward engagement' with the ratchet teeth |42-'see Fig. 1. Inthe present instance, these ratchet teeth on the shaft 2| are ydesignated by the numeral |42. In the patent, the ratchet'teethare designated by'the numeral 28 and are a part of the shaft |61 The function of the power pawl |43 carried by the handle 21 is substantially the same `sfthat of the power pawl 3| sho'wnand described inPatent No. 1,937,331.'

The spring |28 actuates this pawl indicated in Fig.- 1 by the'nu'meral |43 and carrying theportion |44, pivotally supported as at |45, is substantially the same as the pawl 3| carrying the stop 59 and pivotally supported at 3|), illustrated in Fig. 5 of said patent. However, in the present instance, spring |38 normally constrains the plunger member |21 toward its seated position and thereby differentiates from the spring 84 shown in Fig. `4 of the before mentioned patent, which is constrained in the opposite direction. In other words, spring |28 in this instance, has the` same function that the nger piece 8| has in the aforesaid basic patent disclosure. By reason of this simplification, the shoulder 85 and the curved portion I3! of the pawl of the patent are not required. The mechanism for reciprocating the rod |3| and carried by the handle near the free end thereof is substantially that shown in the broken away portion immediately and to the left in Fig. 4 of Patent No. 1,937,331, and is not duplicated herein, although it or equivalent mechanism is comprehended within the present invention,

The load chain |12 in Fig. 2 is shown having one end and the surplus end secured to the boss |1I on the housing. The chain |12 for load lowering passes inwardly into the opening |13 forming the communication to the chamber |9. -The chain then engages the sprocket 2|) and then passes downwardly and outwardly, as shown immediately to the right in Fig. 2. This is the simple or single-line chain operation.

From the foregoing, referring to the hoist operationy per se, as previously pointed out, the chain |12, when relieved from load, may be pulled through they hoist in the load elevating direction as a free-chain structure and the handle mayr remain stationary. For load elevating, reciprocation of the handle causes rotation of the load or .power sprocket 29 and as before stated-see Fig. l-during this operation the brake mechanism and the governor mechanism remain stationary.

In order to lower the load, the rod |3| is actuated and the handle tilted further to tilt lever |39-see Fig. 2--which releases the brake to the desired degree, dependent upon the amount of tilting of member |39. Thus, the operator has control of load lowering. Should the speed of lowering, due to the operators ignorance or carelessness, exceed that for which the hoist is ad-r justed for safety, the governor structure automatically becomes operable and the counterweightssee Fig. -cause the shoes to engage the adjacent braking portion of the-hoist to retard the rate of lowering to that for which the centrifugal governor is adjusted.

In this load lowering the pawl 92--see Fig. 4-due to the reversal of the rotation of the ratchet wheel, engages one of the teeth thereof and does not ratchet relative to the wheel, and, therefore, holds the planetary housing 8| so that the* pinion gears rotate within and revolve around in the ring gear 9| which causes the brake supporting shaft .and the governor supporting shaft to rotate through the planetary system. Therefore, in load lowering vunder load and controlled through the handle, the brake mechanism and the governor mechanism rotate at a greater speed than the load chain sprocket rotates, although proportional thereto, which insures betteror more positive .operation of the brake mechanism and governor mechanism.

Whenever it is desired to obtain free chain movement in the load lowering direction and without load on the chain, for the reasonshereinafter set forth, the rod IDI-see Figs. 2, 4 and '1-is pulled outwardly and if it is not desired to hold it outwardly manually, the rod is turned a quarter turn and the pin ||J3a isv seated in the notches I9 la-see Figs. 7 and Li--vvhich holds the spring |00 extended and pawl 92 out of ratchet engagement.

If there be load on the chain, the locking dog 92 will not release from the ratchet due to the draft before mentioned-see Fig. 4. Reverse rotation of the ratchet, therefore, is required but only to a sufficient degree to clear the draft interlock on the pawl and when that clearance is effected, the pawl 92 is released by its spring |00 in opposition to spring'96 and is withdrawn and held out of ratchet tooth engagement. 'Ihen the chain may be operated as a free-chain in the load lowering direction. In this free-chain movement, the brake mechanism is stationary and, therefore, the governor structure is not operable and the sun gear accordingly remains stationary so that the pinions and the ring gear rotate with the load or power sprocket.

The load may be held in suspended relation vby the handle being moved into position so that the plunger |21 does not engage the lever |39 which actuates the brake and the brake mechanism .thus is retained in braking position, and Athe handle is prevented from being rotated in a counterclockwise vdirection opposite to the load elevating `direction because the pawl 92 engages the ratchet and holds the ratchet stationary. Dropping of the load cannot be accidentally effected as long as there is weight or load on the chain because of the dra-ft |04 on the pawl 92. The chain without load only can be dropped intentionally by releasing the pawl 92 as aforesaid and operating the handle 21 to -free its pawl from its draft lock. Thereupon the chain will escape and drop, and the handle, if moved at all, will only swing upwardly in a counterclockwise directionuntil it engages the stop |98.

In the form of the invention illustrated in Figs. 8 and 9, numerals of the three hundred series indicate parts identical with or similar to those of the primary series illustrated in Figs. 1 to '1 inclusive. Numerals of the four hundred series have been utilized without regard to the primary series of numerals.

This form of .the invention incorporates a chain and wheel as a source of power in place of the ratchet operating lever handle type shown in Figs. 1 to 7, and a chain guard. In Figs. 8 and 9 the power is applied tothe load chain sprocket through the planetary system in a manner broadly similar to that illustrated in application Serial No. 49,919. The present form of the invention includes the governor or speed control structure as well as the 'braking structure, both, however, operative relative to the load `chain through the planetary system. The braking structure and planetary release mechanism is similar to that illustrated in the first illustrated form of the invention, but operable by means associated with the chain power wheel dissimilar to that of the' handle lever associated means shown herein.

In the present form of the invention, loadl sprocket 320 is rigid with shaft 32| within which 1s mounted shaft 324 in turn rigid. with shaft por# tion 359. The braking structure includes drum 363 and plate 360 rotatably mounted. on shaft 359. A one-way clutch structure locks the plate 360 to the shaft 359-324 in load lowerngmoveprevent relative rotation vapplicationSerial No. 49,919, Figs. 8 and 10v herein disclose a ratchet 468. rigid with shaft 359 by the key461 and having Lteeth 469 engaged by pawls or dogs 412 pivoted at 413 on the inside face ofrplate 360 and angle brackets 413al secured to plate 360 and 413D. Springs 414 secured at 415 and 415a to the plate 360 normally constrain dogs 412 into ratchet tooth engagement andpermit relativerotation in .load elevating direction but vin the load lowering direction. f As disclosed in Fig. 10 and the last mentioned application, a plurality of pairs of pawls are provided and ther spacing between adjacent. pawlsfof different pairs is unequal for the purpose mentioned in said application. A Shaft 359 has teeth 389 constituting the sun gear meshing4 with pinions 388 rotatable on trunnions v381 carried by plate 386 keyed as atf385 to shaft 32|. against rotation bythe holding pawl (similarto pawl 92- in. Fig. 4) engaging ratchet teeth 382 of' member 38|load gear 320 isrotated through the planetary, system for loadv elevation. This 'ar" rangement, while operating to elevate loads at a slower rate than the first form of the present in.

vention, is capable of elevating greater loads for the same effort applied to the shaft 324 as is applied to shaft 24.

In' this form of the invention the braking structure and governor structure are normally ineffec- 3, 4 and '1. Member |0|.`-|03 controls this pawl, not'showngbutr associated with ratchet 382.

Shaft 344-jsee Fig. 8-is the brake control shaft similar to shaft 44 shown in Figs. 1, 2, 3, 5 and`7, on its free end smounted the hub of arm 425. Arm f425 isr recessed at 426. A plunger l 426a--see Fig'. 12kis slidable therein and is pro- When the ring gear 390 is held jected outwardly by spring 421 also seated in socket or recess 426. vPlunger 42'6a includes a tooth portion 428 With'relieved face 429. A pin 430 is secured to plunger 426aand rides in slot 43|inarm425.. Y Y, y

Pawl 4|9-see Fig. 9-includes a tooth'432 and an approach cam face 433. In the loadelevating movement-y (counterclockwise rotation) of whee1`4|4 the-pawl 4|9 has its cam face 433engage relieved lface 4290i plunger `42|la and depresses the-latter without rocking lever arm 425.

Spring ||0, see Fig. 3, normally constrains shaft' 44 and arm |25 toward the right-seeFig. '2. Arm 425 in a similar vmanner ris constrained toward the position shown in Fig. 9.

When it is desired to' hold the load inelevated position, all parts are positioned as shown.k

When itis desired to lower the load, wheel 4|4 isV reversedv until tooth 432 engages tooth 428. Continued reverse rotation thereupon tilts arm 425 Yclounterclockwise to rock shaft 344 to release the brake mechanism to the desired degree dependent upon the amount of reverse rotation.

, Whenv brake release is effected, the speed control,

tive during load elevation, but are eifective for load holding and/or in load lowering.

Portion 354 of shaft 32|, see Fig. 8, is rotatably supported on shaft 324 by rollers351 at one end and 4by 'rollers 405 at the other end. Shaft 32|' naturally automatically becomes effective and prevents load dropping should brake failure occur. Of course, if there is disengagement between member 4| 9 and 426a the brake mechanism immediately is effective for braking.

Av spring 440 carried by the wheel 4|4-see Fig.'

9--normally constrains pawl 4|9 into ratchet engagement. In the reverse rotationof the wheel is alsorotatable at one end-in bearing 355 of partition plate 353 and in .bore 322 of housing 3|| at 323. An Alemite lubricator 406 is associated with passage 401 to supply lubrication( `Keyed as at 408 to the exposed end of shaft 324 is hub 409 of a ratchet 4|'0 having teeth 4| |.l

Washer` 334 and nut 332'retain the ratchet on the shaft 324.` Encircling hub 409 are rollers 4|2y supporting hub 4|3 of thechain wheel 4|4 having the chain groove peripheryr 4|5.

vating rotation of Wheel 4|4, the tooth 420 engages the adjacent ratchet tooth 4|| of ratchet 4'|0 so that shaft 324 rotates to transmit power through the planetary system to the load chain sprocket 320 to elevate the load. The ratchet clutch shown in Fig. 10 permits such movement without brake release or governor action. I'he pawl associated withthe planetary gear housing ratchet teeth 382 has its usual function at `this period of operation. It is not specifically illustrated herein because it is similar to pawl 92 shown in Fig. 4. The brake control mechanismsee Fig. 12-is associated therewithin a similar' manner and herein control parts 40|a, 40|, 402a,

. 50. Seated Atherein is the transverse link endless chain 4|6 retained therein and on the wheel by chain guard arms 4|8 rigid with housn 4|4 forkbrake release, if the load isl positioned immediately adjacent the hoist, the power ratchet and pawl connection permits the load to remain stationary while the wheel is reversely rotated to cause pawl 4|9 to engage plunger 426a.

-In Figs. 11 and 12 there is illustrated anmproved and safer-'form of the invention illustrated in Figs. 8 and 10, inclusive. iNumerals of the five and six hundred series indicate'parts identical or similar to those'illustrated in Figs. 8.

to4l 10. by numerals'of the three and four hundred series, respectively.

, Since ,y the brake mechanism, speed control mechanism, planetary mechanism, immediate brake` releasing mechanism, one-way4 ratchet clutch mechanism, combination ratchet and ring-l geary mechanism, and power applying mechanisml herein are substantially identical to that illustrated in'Figs. 8`to10, no further description thereof is believed necessary. n

The presentformof the invention showsthe Alemite fitting 606 and supply passage 601 positioned opposite that shown Vin Fig. 8 since in Fig. 14 the cover housing` 5|| supports an arcuate guard 699 that partially envelopes .offset por- :tion 698 of the chain power `wheel6|4. This guard, having reference to Fig. 12is discontinvice 691.

403 and 403a are similar to the corresponding'oneV hundred -series numbered parts .shown in Figs. '75

uous forthe lower left hand quadrant portion of the power Wheel to provide clearance for the brake release mechanism.

Herein. also-see Fig. ll-between collar 555 and portion 554 is interposed 'an anti-frictiondelSimilarly betweenhubportion 523 and bearing portion;,522 there is interposed an antifriction device 696; l In this form of the invention the chainY guard 6H instead of being superposed relative to the chain wheel is reversed relative thereto-seeFig 12-and the power chain 6I6 passes between th supporting arms 6|8 thereof.

Herein inner shaft 524 is longitudinally `bored as lat 695 and the outer end thereof is threaded at 694 to receive a headless threaded closure 693. The opposite and closed end of the bore communicates by ducts 692 with the chamber 583. In this manner, lubrication can be supplied directly to the interior of the planetary system. This lubrication may differ, if desired, from that supplied to the other and associated parts by the fitting 666. f

The major improvement, however, is in that portion of the invention which is interposed between the power transmitting and brake actuating pawl 619 and the brake operating shaft 544y and the adjacent cooperating parts carried thereby.

In this form of the invention-,see Fig` 12- pawl 6l!! includes the tooth portion l6232 relieved as at 633 for the purpose described. Pawl |9 is pivotally supported at 62! on the offset bracket 632a secured at 623 to the power wheel` portion 6M, Pawl 6H? includes tooth 620 and the, adjacent end of the pawl Vis squared as at 62M. Spring 6M) normally constrains the pawl into ratchet tooth engagement.

The housing 51| at 5I Ia-see Fig. l2-includes a stop portion, the purpose of which will be set forth hereinafter. The lever portion 625 carried by the free end of brake releasing shaft 544- see Figs. ll and 12-mounts the spring pressed plunger 629 so formed on its projecting portion that when engagedby portion 633 of the pawl in counterclockwise rotation of the power wheel, the plunger is forced inwardly into the socket in said arm 625. Y

Upon reverse rotation of the power wheel for load lowering and brake release, tooth 6'32 engages the projecting face of plunger B2S-see Fig. l2-and continued rotation of the power wheel tilts lever 625 to rock shaft 544 to secure brake release in the manner previously described herein. The resistance to such tiltingtilts pawl SIB until in the continued rotation of the power wheel, portion 6260, of the pawl engages stop 5I la and further reverse rotation isprevented. This stop engagement prevents shearing Yor breaking off of the projecting end of theplunger 629.

While the invention has been described and illustrated in great detail in the foregoing de scription and drawings, the same is for example only and not in sense restrictive in character.

The several modifications illustrated and vdescribed, as well as others which will readily suggest themselves to persons skilled in this art, are all considered to be within the broad scope of the invention, reference being had tol the appended claims.

The invention claimed is:

l. In a reversing hoist, a handle, a ratchet engageable pawl pivotally supported on the handle, an arm carried by the pawl, a leverv operable rod for tilting the arm for pawl movement, a longitudinally movable hoist control member carried by the handle and bodily movable parallel to thepivotal axes of the pawl and handle, means opposing rod tilting of the pawl, a tiltable lever carried by the member and associated with the arm for tilting said lever and securing longitudinal movement of the member, and means opposing the effect of the first mentionedmeans and associated with the member.

2. In a hoist structure, the combination of a power operable shaft, a load chain engageable sprocket thereon, a planetary transmissionvincluding a sun gear, planetary pinions, a carrier therefor rigid with the shaft, and a ring gear, the pinions being revolvable about the sun gear in the rotation of the power shaft when the sun gear is rotatable therewith, a supplementary shaft rigid with the sun gear, a brake drum also rigid therewith, a housing enclosing all of the aforesaid, a brake band for the brake drum normally constrained to lock the sun gear shaft to the housing, a ratchet mechanismV operatively associated with the ring gear of the planetary system, and pawl means normally constrained to ratchet engagement and when engaged permitting power shaft and ratchet rotation in load elevating direction without sun gear rotation, said pawl means when disengaged from the ratchet permitting sun gear rotation with power shaft rotation in the load lowering direction upon removal of brake band constraint.

3. A device as defined by claim 2, characterized by the addition of a speed governor including centrifugally operable means rotatable with and by the sun gear auxiliary shaft and rotation retarding means operatively engaging the housing for retarding the sun gear auxiliary shaft, power shaft and brake drum rotation in load lowering direction upon predetermined speed thereof in load lowering direction.

4. In a hoist structure, the combination of a power shaft having a channel extending therethrough, means closing one end of said shaft, a power member for rotating said shaft and detachably associated therewith and retained in associated relation by said closing means, a planetary transmission including a sun gear, sun

gear shaft, planetary pinions and a ring geark and a pinion support, the ring gear having a chamber formation for nesting the planetary pinions and sun gear, the power shaft extending into said chamber and having operative connection with the pinion support for rotation of the pinions with and by the power shaft, said passage communicating with said chamber, and closure means interposed between the sun gear shaft and the ring gear for retaining lubricant in said chamber.

5. In a hoist, the combination of a power shaft and load elevating means thereon, a handle having a pawl and engaging a ratchet operatively connected with said shaft, a brake normally constrained to brake operation, a one-way clutch between the brake structure and the power shaft permitting shaft operation in load elevating direction without operation or -movement, saidv clutch connecting said power shaft and brake for braking or holding of the power shaft when not power rotated, means in juxtaposition toY the handle and engageable thereby and connected to the brake, said means operating the brake in opposition to the brake constraint to permit load lowering, and manually operable handle supported means permitting or preventing the last mentioned engagement as desired.

6. In a hoist including a ratchet, a power shaft, manual means for rotating the shaft in one direction, a pawl carried by the means for ratchet engagement and shaft rotation,- abrake structure operatively associated with the shaft and brake operating mechanism controlled by the means including a rock-shaft, an operating arm thereon, a lever for operating *said armto` operate said brake, and other means carried by `flexible, load elevating and lowering means, ro-

the first mentioned means and manually controlled thereby for lever engagement for brake operation.

7. In a hoist, the combination of a two-part housing, a power shaft therein and projecting therethrough, means coaxial with the power shaft for rotating the same and external of and to one side of said housing said two-part housing providing a chamber therein and a load chain sprocket in said chamber rotatable by and with said power shaft, a chambered `extension on one of the housing parts, Asaid last mentioned housing part including a partition from which the shaft extends, operating mechanism within said second mentioned chamber, a detachable closure for the latter, a well portion depending from the second mentioned chamber forming portion, and a closure for the well portion.

3. A device as defined by claim 7, characterized by the addition of an operating shaft having operating means within the well portion and projecting therefrom Aancl toward the other housing portion, anda projecting portion on the other housing portion including a bearing for said well projecting shaft.

9; In a hoist, the combination of an elongated tatable means for moving same, a power shaft for rotating said rotatable means, a planetary system yoperatively associated with the shaft, a

ratchet directly associated With the planetary ring gear, a pawl normally constrained to ratchet engagement and permitting ring gear rotation in one direction and preventing reverse rotation thereof, means operable in opposition to the constraint for withdrawing the pawl from ratchet engagement to permit ring gearrrotation in the reverse rotation, and means normally arrangedto prevent (lateral movement of the last mentioned means'y on pawl release and capablefof locking said means in pawl release position when intentionally moved thereto. l

l0. A hoist as defined by claim 9, characterized by the pawl and the ratchet teeth having y complementary draft formations whereby the 2O teeth are mutually self-locking in one direction, o

pawl tooth withdrawal fromr ratchet tooth engagement requiring initial rotationl of the ratchet in ratcheting direction forfreeing the pawl from ratchet locking association for subsequent rotation of the ratchet in the reverse direction.

FREDRICK W. COFFING. 

